Mitsubishi Electric HG-KR73B HG-KR Rotary Servo Motor

SKU HG-KR73B

In stock

12-month warranty
Free returns within 30 days

Manufacturer: Mitsubishi Electric
Product No.: HG-KR73B
Country of origin:United States
Product Type: Servo Motors
Payment: T/T, Western Union
Weight: 3800g
Shipping port: Xiamen
Warranty: 12 months

Delivering high-precision motion control in a low-inertia design, this 750W rotary servo motor is engineered for high-duty dynamic positioning applications. The Mitsubishi Electric HG-KR73B features an integrated electromagnetic brake and a high-resolution absolute encoder to ensure stable performance and safety under demanding industrial loads. It integrates seamlessly with MR-J4 series servo amplifiers to provide reliable velocity and position loop control.

Key Features

Low Inertia Design: Optimized for high-frequency positioning cycles and rapid acceleration/deceleration.
Electromagnetic Holding Brake: Built-in safety brake designed for vertical axis control and position retention during power-off states.
High-Resolution Feedback: Equipped with a 22-bit absolute/incremental encoder providing 4,194,304 pulses per revolution for exceptional positioning accuracy.
Robust Protection: IP65-rated totally enclosed, self-cooled construction suitable for challenging industrial environments.
Flexible Integration: Fully compatible with CC-Link IE Field, SSCNET III/H, and general-purpose pulse/analog interfaces via compatible MR-J4 amplifiers.

Applications

High-speed packaging machinery and labeling systems.
Material handling systems and pick-and-place robotic gantries.
Multi-axis CNC feed systems and textile machinery.
Vertical lift axes requiring positive-lock holding brakes.

Technical Specifications

Parameter	Value
Manufacturer	Mitsubishi Electric
Model Number	HG-KR73B
Series	HG-KR (Low Inertia, Small Capacity)
Rated Output	0.75 kW (750 W)
Rated Speed	3000 r/min
Maximum Speed	6000 r/min
Rated Torque	2.4 N.m
Maximum Torque	8.4 N.m
Rated Current	4.8 A
Maximum Current	17 A
Voltage Class	200V AC
Power Supply Capacity	1.3 kVA
Moment of Inertia (J)	1.37 x 10^-4 kg.m2
Encoder Type	22-bit Absolute/Incremental (4,194,304 pulses/rev)
Electromagnetic Brake	Installed (Holding brake)
Thermal Class	130 (B)
Protection Rating	IP65 (excluding shaft-through portion)
Vibration Resistance	49 m/s2 (X and Y directions)
Operating Temperature	0 to 40 degC (non-freezing)
Net Weight	3.8 kg
Shipping Weight (Calculated)	5.0 kg

Compatible Servo Amplifiers

Interface Type	Compatible Models
CC-Link IE Field Network	MR-J4-70GF, MR-J4-70GF-RJ, MR-J4-70B-RJ010
SSCNET III/H Interface	MR-J4-70B, MR-J4-70B-RJ
Multi-Axis SSCNET III/H	MR-J4W2-77B, MR-J4W2-1010B
General-Purpose (Pulse/Analog)	MR-J4-70A, MR-J4-70A-RJ

Empirical Engineering Insights

Alternative Models & Compatibility

The HG-KR73B serves as a direct upgrade path for legacy HF-KP73B series motors. When transitioning from HF-KP to HG-KR, ensure that the servo amplifier firmware is updated to support the 22-bit encoder resolution. Physical mounting dimensions (flange size and shaft diameter) remain identical, allowing for straightforward mechanical retrofits.

Application Pitfalls & Engineering Notes

The integrated electromagnetic brake on the HG-KR73B is strictly a holding brake and must never be used for dynamic deceleration or emergency stopping. Engaging the brake while the motor is rotating at high speed will cause rapid wear of the friction plates, leading to premature mechanical failure. For high-duty vertical axes, ensure the amplifier's brake output delay time (MBR signal) is correctly calibrated to prevent axis drop during power-up sequences.

Commissioning & Wiring Tips

Always use dedicated, double-shielded encoder cables to connect the HG-KR73B to the MR-J4 amplifier. High-frequency noise from the motor power lines can corrupt the 22-bit serial encoder data if run in the same conduit without proper shielding. Ensure the motor frame is grounded directly to the amplifier's ground terminal, and verify that the 24V DC power supply feeding the electromagnetic brake is regulated and isolated from the control logic power supply.

Installation Guidelines

CRITICAL WARNING:

Ensure all primary AC power sources are completely de-energized and locked out before attempting installation or maintenance. Wait at least 15 minutes for the servo amplifier's internal bus capacitors to fully discharge. Verify zero voltage across the bus terminals before handling motor power connections.

1

Mount the motor securely to a rigid, flat metal surface to facilitate heat dissipation. Ensure alignment of the motor shaft with the load coupling is within the specified radial (392 N) and thrust (147 N) limits to prevent bearing wear.

2

Connect the encoder cable and power cable to their respective receptacles. Ensure the connectors are fully seated and locked to maintain the IP65 environmental seal.

3

Wire the electromagnetic brake terminals to a dedicated 24V DC power source controlled by the amplifier's brake interlock (MBR) relay. Do not share this 24V line with inductive sensors or high-noise devices.

4

Perform a trial run at low speed without a mechanical load to verify correct rotation direction, encoder feedback, and holding brake release functionality before full system commissioning.

FAQ

What is the primary function of the electromagnetic brake on the HG-KR73B?

The integrated electromagnetic brake is designed strictly as a holding brake to prevent the motor shaft from rotating when the power is turned off or during an emergency stop. It must not be used for dynamic deceleration.

Which servo amplifiers are compatible with the HG-KR73B motor?

It is compatible with Mitsubishi MR-J4 series 200V amplifiers, including the MR-J4-70GF (CC-Link IE Field), MR-J4-70B (SSCNET III/H), and MR-J4-70A (General-Purpose).

What is the resolution of the encoder on this motor?

The motor features a 22-bit absolute/incremental encoder, which provides a resolution of 4,194,304 pulses per revolution.

What is the environmental protection rating of the HG-KR73B?

The motor has an IP65 rating, which protects it against dust and low-pressure water jets. Note that this rating excludes the shaft-through portion.

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Global Express Shipping

Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our professional technical warranty.

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